After talking with design, let's test using scale: 1.14 on plain button icons, and then using font-size: icon--lg with a medium line-height (so the button shape doesn't change) and compare the two to see which is the better technique.

Once that's determined, we can look at making this change to either plain buttons or maybe narrowing the scope (docked, buttons in a compass sidebar, with some kind of size modifier). And we'll also want to update the alert component - there is a scale to make the icon larger that we likely want to style the same.

Jira Issue: PF-4028